Bone from whole bird included (7)
I believe the answer is:
sternum
'bone' is the definition.
(the breastbone)
'whole bird included' is the wordplay.
'whole' becomes 'sum' (sum is a kind of whole).
'bird' becomes 'tern' (tern is a kind of bird).
'included' means one lot of letters goes inside another.
'sum' placed around 'tern' is 'STERNUM'.
'from' is the link.
(Other definitions for sternum that I've seen before include "Human bone -- ten rums (anag)" , "Munster (anag.)" , "Breastbone" , "big bone" , "front of breast" .)